Both his parents were killed by a member of Al Capone's Gang when william was very young. He was left in the care of his butler, marcus, who was an ex-meister. Marcus taugh william the basics of being a meister before sending him to DWMA.

He first appears in the top of a steeple, faceing off ageinst a Masked Man . He exchanges a few words before attacking the man, but is knocked off the steeple. He uses his shadow weapon's grapling hook form to hook the masked man to a gargoyle whilst the man is escapeing on a hellicopter, which causes the man to fall to his death. Upon reaching the bottom, it is shown that his shadow weapon, Robin , has already consumed the man's soul. Stateing that they have reached their soul quota for the day, he leaves into the night